package com.heima.api.getway.filter;

import com.heima.api.getway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

public class AuthorizeFilter implements Ordered, GlobalFilter {
    /**
     *
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        // 2.判断是否是登录
        if( request.getURI().getPath().contains("login")){
            // 放行
            return chain.filter(exchange);
        }
        // 3.获取token
        String token = request.getHeaders().getFirst("token");
        // 4.判断token是否存在
        if(StringUtils.isBlank(token)){
            // 设置响应码为401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 5.判断token是否合法
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        } catch (Exception e) {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 6.放行
        return chain.filter(exchange);
    }

    /**
     * 设定优先级 值越小 优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
